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An audo signal of 15 KHz frequency canno...

An audo signal of 15 KHz frequency cannot be trasmitted over long distances without modulation because

A

the size of the required antenna would be least 5 km which is not conveient.

B

the audio signal can not be trasmitted through sky waves.

C

effective power transmitted would be very low. If the size of the antenna is less than 5 km.

D

all of these

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The correct Answer is:
D
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